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Aleph J illustrated build guide
Aleph J illustrated build guide
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Old 17th November 2018, 04:11 PM   #3121
mr_phil is offline mr_phil
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Another pair of monobloc J's lives. First impressions are that SQ is little different from my reference class D and class AB. I will put some hours on it and report back soon
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Old 18th November 2018, 02:24 AM   #3122
Mazeppa is offline Mazeppa  United States
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Aleph J illustrated build guide
Quote:
Originally Posted by mr_phil View Post
Another pair of monobloc J's lives. First impressions are that SQ is little different from my reference class D and class AB. I will put some hours on it and report back soon
Will begin assembly of an Aleph J soon as a stereo amp, so am interested in hearing how they work out for others.

May I ask the details of your reference Class D & AB amps?

Beginning to wonder about getting a more efficient amp for summer use that can rival a Pass Class A for SQ, and it would have to be close, or I'll just pay the AC bill difference.
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Old 18th November 2018, 10:30 AM   #3123
mr_phil is offline mr_phil
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The AB is the Pink Fish Media Hackernap design which is thought to be better than the Naim NAP250 and the class D is the Connex but I have auditioned a borrowed Hypex in my system with little difference. Look up the Connex, good value for money, cool and small

I would endorse a previous contributor and recommend checking every component before soldering; component removal with plated through holes is a pain. I built mine into the mini dissappente boxes in 3U height and the heatsink gets to 42c after an hour or so
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Old 19th November 2018, 05:53 AM   #3124
Mazeppa is offline Mazeppa  United States
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Aleph J illustrated build guide
Quote:
Originally Posted by mr_phil View Post
The AB is the Pink Fish Media Hackernap design which is thought to be better than the Naim NAP250 and the class D is the Connex but I have auditioned a borrowed Hypex in my system with little difference. Look up the Connex, good value for money, cool and small

I would endorse a previous contributor and recommend checking every component before soldering; component removal with plated through holes is a pain. I built mine into the mini dissappente boxes in 3U height and the heatsink gets to 42c after an hour or so
Connex website shows several Class D products.
Would you specify the one you're using, please?
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Old 19th November 2018, 09:29 AM   #3125
mr_phil is offline mr_phil
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CxD500 with SMPS600R power supply (1 per channel) - if my memory is correct. No heat worth talking about (unlike the class A's !), fully protected and only a couple of hours to assemble - not really a DIY project except for the case

Last edited by mr_phil; 19th November 2018 at 09:36 AM. Reason: correction to part numbers
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Old 20th November 2018, 04:16 AM   #3126
Mazeppa is offline Mazeppa  United States
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Aleph J illustrated build guide
Quote:
Originally Posted by mr_phil View Post
CxD500 with SMPS600R power supply (1 per channel) - if my memory is correct. No heat worth talking about (unlike the class A's !), fully protected and only a couple of hours to assemble - not really a DIY project except for the case
Thanks, studying.

Find myself particularly intrigued by the claim of SMPS's with EMI emissions comparable to a good linear power supply.
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Old 21st November 2018, 11:25 PM   #3127
pvg320 is offline pvg320  United States
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Another one up! I used my 4U chassis and store boards. I pulled a perfectly good (and great sounding) F4 out of the 4U, and took the plunge into Aleph world.

I found that if one mistakenly reverses the Zeners, that full rail voltage will be present on the outputs, but nothing destructive. Best possible builder error situation with no smoke released.

After an hour of warm up and bias check, I gave it a listen - there's definitely more harmonic 'juice' than the F4 but detail is absolutely still there. Really enjoying it so far, and looking forward to reviewing my music collection with it.

I'm driving a pair of Paul Carmody Carreras with the AJ and an Aikido 5687 pre - this rig is actually louder than my BA3 FE + F4!

Thanks 6L6 for another great build guide.
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Old 21st November 2018, 11:58 PM   #3128
Dennis Hui is offline Dennis Hui  Canada
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Aleph J illustrated build guide
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We are fearless amplifier builders. A little heat doesn't scare us at all.
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Old 22nd November 2018, 01:06 AM   #3129
JSA1971 is offline JSA1971  Canada
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Aleph J illustrated build guide
Congratulations! Itís a great amp, youíre gonna love it!
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Old 23rd November 2018, 01:42 AM   #3130
Eric is offline Eric  United States
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Aleph J illustrated build guide
Finally had some time to finish my Aleph-J while the turkey was in the oven today. This is my third amp that makes use of my modular power supply.

It runs on +/- 21v rails with ~1.25A bias per mosfet, so the completed amp consumes about 200w out of the wall with a final sink rise of 31c above ambient. I used Keratherm pads for the mosfets and the big silver caps are Russian MBGCh. The CRC power supply has ~70kuF per rail and the amp has another 200kuF inside - 50kuF per rail per channel. The caps are held in place with silicon caulk and wire ties. Final offset is about 3-4mV.

Wood for the chassis is a nice Walnut that I found locally with a few coats of shellac on it. The sinks were a flea market find for $12 total and the metal plate on the bottom came from an old television that I disassembled to recycle. The legs keep the bottom of the sinks about 1.5" above the tabletop for good airflow. Turns out I could have pushed the bias a bit higher, but my pots ran out of room to adjust.

I'm hoping to get it installed tomorrow so I can give it a listen.
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